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( Neomura)
Neomura is a speculative clade composed of the two domains of life of Archaea and Eukarya. The group was first proposed by Thomas Cavalier-Smith and its name means "new walls"; so called because it is thought to have evolved from Bacteria, and one of the major changes was the replacement of peptidoglycan cell walls with other glycoproteins. The adjectival form is Neomuran, and a single individual from the group is called a Neomuran. &_160;Archaea &_160;Eukarya The Neomura are a very diverse group, containing all of the multicellular species, as well as all of the most extremophilic species. But they all share certain molecular characteristics. All Neomurans have histones to help with chromosome packaging, and most have introns. All use the molecule methionine as the initiator amino acid for protein synthesis (Bacteria use formylmethionine). Finally, all Neomurans use several kinds of RNA polymerase, whereas Bacteria use only one.
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